Poisonous/Cautions

Distribution

Common ragweed is common in all parts of southern
Ontario and giant ragweed is found in south western Ontario. A
common weed in disturbed soils or where the overstory of tree
and shrub growth has been removed.

Growth Habit

Annual

Method of Propagation

Seeds

Control

Susceptible to 2,4-D, dicamba, glyphosate
and a number other in crop herbicides. Common ragweed is listed
on the label of many herbicides. Some labels also include giant
ragweed. A single mowing will delay but not prevent flowering.
Repeated mowing is necessary to prevent pollen release.

Other Comments

Giant ragweed flowers (sheds pollen) in mid
July and common ragweed flowers in mid August.

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